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Table 1 Demographic characteristics of patients with HD, ALS or CSA

From: Electrophysiological differences between Hirayama disease, amyotrophic lateral sclerosis and cervical spondylotic amyotrophy

  HD ALS CSA Normal controls
N 100 90 30 35
Male/Female 95/5 52/38 19/11 25/10
Mean onset age (years) 19.8 (14-27) 56.4 (36-72) 54.8 (42-76) 27.2(20-41)
Mean duration (months) 14.5 (6-30) 24.8 (3-48) 26.2 (3-60)  
Unilateral upper limb affected 78 37 22  
Bilateral upper limbs affected 22 53 8  
  1. HD, Hirayama disease; ALS, amyotrophic lateral sclerosis; CSA, cervical spondylotic amyotrophy.